Multiple choice Which of the following explains why the Earth has seasons? Earth's axis is tilted as it revolves around the Sun. The distance changes as it revolves around the Sun. The Moon revolves around it. The Sun's axis is tilted. Reveal answer Fill a bubble to check yourself A Correct answer Explanation The Earth's seasons are caused by the tilt of its axis (about 23.5 degrees) combined with its orbital revolution around the Sun. This tilt causes different parts of the Earth to receive varying angles of sunlight throughout the year.